package com.kob.matchingsystem.service.impl.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.ReentrantLock;
@Component
public class MatchingPool extends Thread{
    private static List<Player> players=new ArrayList<>();
    private final ReentrantLock lock=new ReentrantLock();
    private static RestTemplate restTemplate;
    private final static String startGameUrl = "http://127.0.0.1:3000/pk/start/game/";

    @Autowired
    public void setRestTemplate(RestTemplate restTemplate){
        MatchingPool.restTemplate=restTemplate;
    }

    public void addPlayer(Integer userId,Integer rating,Integer botId){
        lock.lock();
        try {
            players.add(new Player(userId,rating,botId,0));
        }finally {
            lock.unlock();
        }
    }

    public void removePlayer(Integer userId) {
        lock.lock();
        try {
            List<Player> newPlayers = new ArrayList<>();
            for (Player player: players) {
                if (!player.getUserId().equals(userId)) {
                    newPlayers.add(player);
                }
            }
            players = newPlayers;
        } finally {
            lock.unlock();
        }
    }

    private void increaseWaitingTime() {  // 将所有当前玩家的等待时间加1
        for (Player player: players) {
            player.setWaitingTime(player.getWaitingTime() + 1);
        }
    }

    private boolean checkMatched(Player a, Player b) {  // 判断两名玩家是否匹配
        int ratingDelta = Math.abs(a.getRating() - b.getRating());
        int waitingTime = Math.min(a.getWaitingTime(), b.getWaitingTime());
        return ratingDelta <= waitingTime * 10;
    }

    private void sendResult(Player a, Player b){
        System.out.println("send result: "+a+" "+b);
        MultiValueMap<String,String> data=new LinkedMultiValueMap<>();
        data.add("a_id",a.getUserId().toString());
        data.add("a_bot_id",a.getBotId().toString());
        data.add("b_id",b.getUserId().toString());
        data.add("b_bot_id",b.getBotId().toString());
        restTemplate.postForObject(startGameUrl,data,String.class);

    }

    private void matchPlayers() {  // 尝试匹配所有玩家
        boolean[] used = new boolean[players.size()];
        for (int i = 0; i < players.size(); i ++ ) {
            if (used[i]) continue;
            for (int j = i + 1; j < players.size(); j ++ ) {
                if (used[j]) continue;
                Player a = players.get(i), b = players.get(j);
                if (checkMatched(a, b)) {
                    used[i] = used[j] = true;
                    sendResult(a, b);
                    break;
                }
            }
        }

        List<Player> newPlayers = new ArrayList<>();
        for (int i = 0; i < players.size(); i ++ ) {
            if (!used[i]) {
                newPlayers.add(players.get(i));
            }
        }
        players = newPlayers;
    }


    @Override
    public void run() {
       while(true){
           try {
               Thread.sleep(1000);
               lock.lock();
               try {
                   increaseWaitingTime();
                   matchPlayers();
               }finally {
                   lock.unlock();
               }

           } catch (InterruptedException e) {
               e.printStackTrace();
               break;
           }
       }
    }
}
